Can someone help verify the identity sin x sin 2x + cos x cos 2x= cos x?
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Verify ' the identity:cOs 2x cos X - sin sin 2x cos *+ sinChoose the sequence of . Steps below that verifies the identity:0 cos 2x sin 2x cos sln 1+2 sin x coscos 2x sin 2xcos 2x eln 2x cor 2x - sln ?x 1 +2sinX corxcos sincos sin (cos X+ sln 2x) +2sin* cos X cos > + sinx) cos * sinx) (cos * + sinx)(cos sinx) cos sin cos * + sincos sin " (cos x+ sin Ex) + 2sinxcosX Cor sln x)( cos sin X) cos sinx)cos X - Sin*) cos sin cos sinCo1 (cos x+eln" 2x) +2unxcoex (cosx+axk corz- sn (cosx + elxKcoe% + eh# Co4 Eein xteln
Video Transcript
We're trying to lớn figure out which mode shows the process of verification of the identity. The coastline of two X is the first thing that appears khổng lồ be being changed. We can work with a number of identities. There are two cosine squares of X-1. We have one minus two squared off. We have cosine squared of X và X & X và X & X và X và X and X & X & X và X and X & X & X and X and X & X and X and X và X & X và X và X & X. The first thing to vì when looking at your answer choices is to vày cosine squared plus sine squared. Answer choice C will be the only one that will work for us.
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